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A couple of days ago, I noticed that my right front tire was going flat. I filled it up and found that it was losing about 2 psi/hour. I could find nothing wrong with the tire. I filled it up again today and took it to Discount Tire. They said the tire was fine but was leaking air out of the TPS. They fixed it for free. Is this even possible? My first vehicle with TPS so I guess I don't understand how they work.